Thermo-electric Couples 



263 



E^ = 826 + 6724c = .000085 



^000 = 2006 + 40000c = .000342 



b = 1623.66 X (10)-8 



c = 43.177 X (lO)-io 



From which 



Iron Copper Thermo couple (fig. 15). Current goes from 

 copper to iron in the hot junction. S = 4000 ohms, hence (d) 

 = .0000308 volts per mm. (see below). Junctions (e) and (g) 

 at 0. 



To determine the constants b and c 



.000218 

 806 + 6400c = .000706 

 6 - 91.94 X (10)-' 

 c = 4.61 X (10)-9 



El* = 246 + 576c = 



From which 



